Malicious PDF — malware analysis report

Static analysis result for SHA-256 8546040c8b89e017…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 18:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d58869bfdb00466a59f33379747b13b2 SHA-1: 6208a77fa6c37c6d3c360c42b87cca79fc8413ac SHA-256: 8546040c8b89e01777cd3583d13eb221a60ea120dddc040ef50ba1fa73c1db42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://draftingfloorplan.com/ckfinder/userfiles/files/dolapozevolewamaruliv.pdf In PDF document text
    • http://netdepphunu.vn/images/userfiles/file/23992409472.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/jozitidopema.pdfIn PDF document text
    • http://annabarons.com/files/files/15073441127.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/15034534393.pdfIn PDF document text
    • https://egca.fr/userfiles/file/kogaful.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mlhvg9j2rajmrrv58uuibodv10/64150504014.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/41227944311.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/03da8966ca9e7bf480a609847a752780/vivexu.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/powoxuforojubep.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/zaxewuzinulajunidegomi.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/64937725132.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/31834818031.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/66057688788.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xokupavolesulufuzadunus.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/65900643342.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/63510675619.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/18657440272.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/buzezesakopugifap.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sosod.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cc8e2735f082de83a433ab6b121d5edd/zejiripepowinokowafu.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/66481664862.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/31811978601.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109122212393387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fingerprint+phone+lock+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 14864 bytes
SHA-256: 1f3276640d6f04d8c2ae0c1cb6c8b668cbcfae5c02efbe39ac6818851f90c783
font_01_sfnt_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 10556 bytes
SHA-256: c3133425afe3f46a04d28eadb2a42ef3231281db6e8cd5b68f7f72838e8d510b